"The brand was recently notified of a security incident through third-party hotel reservation system – the Sabre Hospitality Solutions SynXis," the Orlando-based hotel chain said. "An unauthorized party gained access to account credentials that permitted access to unencrypted payment card information, as well as certain reservation information, for a subset of hotel reservations processed through the reservation system."

"Not all reservations that were viewed included the payment card security code, as a large percentage of bookings were made without a security code being provided," Sabre said in a statement last week. "Personal information such as social security, passport or driver's license number was not accessed."

Luxury hotel chain Loews also reportedly fell victim to the Sabre Hospitality breach. The New York City-based company operates 24 sites across the U.S. and Canada, but it's unclear which locations were affected.

Cybercrime is a growing problem - in 2015, research revealed that more than $315 billion had been lost by businesses around the world during the past year, highlighting a greater need for stronger digital security measures.

“The Hard Rock Hotels & Casinos and Loews Hotels breaches highlight the critical need for better data protection across all industries," says Ermis Sfakiyanudis, cybersecurity expert and CEO of Trivalent. "With the onslaught of high profile breaches this year, encryption alone has proven it is no longer enough to protect sensitive information...the only way to get ahead of data breaches is to address them as a likely probability, rather than an impossibility."